US8648721B2 - Security tag with integrated EAS and energy harvesting magnetic element - Google Patents
Security tag with integrated EAS and energy harvesting magnetic element Download PDFInfo
- Publication number
- US8648721B2 US8648721B2 US12/852,918 US85291810A US8648721B2 US 8648721 B2 US8648721 B2 US 8648721B2 US 85291810 A US85291810 A US 85291810A US 8648721 B2 US8648721 B2 US 8648721B2
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- frequency
- eas
- circuit
- tag
- security tag
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
- G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
- G08B13/2417—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags having a radio frequency identification chip
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0701—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
- G06K19/0702—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement including a battery
- G06K19/0704—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement including a battery the battery being rechargeable, e.g. solar batteries
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0701—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
- G06K19/0707—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement being capable of collecting energy from external energy sources, e.g. thermocouples, vibration, electromagnetic radiation
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2428—Tag details
- G08B13/2431—Tag circuit details
Definitions
- the present invention relates generally electronic article surveillance security systems and in particular to a security system tag and method having an integrated energy harvesting circuit.
- EAS Electronic article surveillance
- a detection system is configured at an exit from the protected area, which comprises one or more transmitters and antennas (“pedestals”) capable of generating an electromagnetic field across the exit, known as the “interrogation zone.”
- Propedals transmitters and antennas
- Articles to be protected are tagged with an EAS marker that, when active, generates a response signal when passed through this interrogation zone.
- An antenna and receiver in the same or another “pedestal” detects this response signal and generates an alarm.
- Certain EAS tags commonly known as “alarming” tags, include a processor and audible alarm transducer within the actual tag device. Thus, the actual tag “knows” when it has been interrogated by an EAS portal and emits an audible alert when triggered.
- EAS tags often include a power supply, such as a battery, that powers the internal components of the tag for use.
- tags often include a battery or similar power supply that is permanently fixed within the tag itself to prevent shoplifters or other persons from removing or tampering with it.
- the tags are typically designed and manufactured such that access to the power supply is unavailable. Such removal or tampering would render the tag inoperable, thus defeating it as a security measure.
- EAS tags are typically removed from an article upon purchase and subsequently stored for reuse on subsequent goods, a tag's ability to be reused may be undesirably limited by the life of the permanently affixed power supply. This limiting characteristic may thus result in the inability to effectively use a tag for a lengthy period of time, instead resulting in discarded tags replaced by tag with a fresh power supply, thereby increasing the overall cost of securing one's goods.
- Some tag solutions include incorporating energy management hardware such as a wake-up switch in order to manage and limit the energy consumption.
- energy management hardware operates to limit tag power, performance and functionality in order to achieve long battery life. Such a result is undesirable.
- tags should be as unobtrusive as possible, affixing a physically large tag to an item can adversely impact the attractiveness of the protected item to the potential item purchaser.
- tags e.g., tags providing both EAS and radio frequency identification (“RFID”) functionality
- RFID radio frequency identification
- the present invention advantageously provides a method and system for providing EAS and RFID along with battery recharging features within a single security tag.
- the EAS security tag includes a rechargeable battery and an antenna having a magnetic core and at least one coil winding disposed around at least a portion of the core.
- the antenna supplies a voltage corresponding to a first frequency or a second frequency depending on the frequency corresponding to the magnetic field the tag is placed within.
- the tag includes an EAS circuit having a resonant frequency corresponding to the first frequency, and an energy harvesting circuit having a resonant frequency corresponding to the second frequency, where the energy harvesting circuit recharges the rechargeable battery.
- the EAS circuit is enabled thus allowing for EAS detection or the energy harvesting circuit is enabled allowing for the battery to be recharged.
- a battery assisted or active RFID element connected to an RFID tag antenna allows for sensor inputs through the I/O pins to generate an alarm message, such as when the security tag has entered into an EAS system. This message is broadcast to an RFID reader which can alert store personnel what items have left the store in an unauthorized manner.
- the RFID element can also generate an alarm or alert message when the battery charge is low, alerting store personnel that the tag needs to be re-charged
- a security tag in one aspect of the invention, includes a rechargeable battery, a magnetic element comprising a magnetic core and at least one coil winding disposed around at least a portion of the core, where the magnetic element supplies a voltage corresponding to applied magnetic fields of a first frequency and a second frequency, an EAS circuit having a resonant frequency corresponding to the first frequency, and an energy harvesting circuit having a resonant frequency corresponding to the second frequency, the energy harvesting circuit converting the second frequency voltage to a battery voltage signal for the rechargeable battery.
- a security tag in yet another aspect of the invention, includes a rechargeable battery, and a magnetic element configured to supply a voltage corresponding to applied magnetic fields of a first frequency and a second frequency.
- the magnetic element includes a magnetic core, a first coil winding disposed around at least a portion of the magnetic core, the first winding corresponding to the first frequency, and a second coil winding disposed around at least a portion of the magnetic core, the second winding corresponding to the second frequency.
- the tag also includes an EAS circuit having a resonant frequency corresponding to the first frequency, and an energy harvesting circuit having a resonant frequency corresponding to the second frequency, the energy harvesting circuit converting the second frequency voltage to a battery recharging signal for the rechargeable battery.
- a method for integrating EAS and battery recharging capabilities within a security tag includes a magnetic element having a magnetic core and at least one coil winding disposed around at least a portion of the core, the magnetic element supplying a voltage corresponding to applied magnetic fields of a first frequency and a second frequency.
- the method includes enabling the EAS mode when the magnetic element is placed within a magnetic field corresponding to a first frequency, and enabling the energy harvesting mode when the magnetic element is placed within a magnetic field corresponding to a second frequency.
- FIG. 1 is a top view of an exemplary EAS system including an EAS tag and an EAS recharging station constructed in accordance with the principles of the present invention
- FIG. 2 is a block diagram showing the components of an EAS tag incorporating the features of the present invention
- FIG. 3 is a perspective view of an exemplary EAS tag constructed in accordance with the principles of the present invention.
- FIG. 4 is a schematic diagram of an EAS tag constructed in accordance with the present invention incorporating an EAS alarm circuit and an energy harvesting circuit;
- FIG. 5 is a schematic diagram of an alternate embodiment of the present invention.
- the embodiments reside primarily in combinations of apparatus components and processing steps related to implementing a system and method for integrating the function of an EAS detection signal, an EAS internal alarm signal, and an energy harvesting function into one element within an EAS tag.
- relational terms such as “first” and “second,” “top” and “bottom,” and the like, may be used solely to distinguish one entity or element from another entity or element without necessarily requiring or implying any physical or logical relationship or order between such entities or elements.
- One embodiment of the present invention advantageously provides a security tag that includes a magnetic element having different modes, an EAS mode, an energy harvesting mode and an RFID mode.
- a circuit in the EAS tag that has a resonant frequency corresponding to an EAS frequency allows the tag to be interrogated by an EAS pedestal in the interrogation zone and to generate a system alarm and a tag alarm.
- the tag alarm can include a sound device like a piezo speaker and a wireless alarm from the RFID element broadcasting to a RFID reader
- the tag can be recharged when placed in proximity to a battery recharging station.
- FIG. 1 an exemplary configuration of an EAS system 8 that includes an EAS security tag 10 according to an embodiment of the present invention.
- security tag 10 is affixed to an item 12 and is positioned proximate two electronic detection units such as pedestals 14 a and 14 b (collectively referred to as “pedestals 14 ”) that form an EAS tag interrogation zone.
- the electronic detection units need not be in the form of standing pedestals 14 but can also be buried under floors, mounted on walls, or hung from ceilings.
- EAS system 8 also includes a tag detacher or tag deactivator (not shown).
- Tag 10 is specifically designed to be affixed to or embedded in merchandise or other items 12 sought to be protected.
- EAS system 8 sounds an alarm, a light is activated and/or some other suitable alert devices are activated to indicate the removal of tag 10 from the prescribed area.
- EAS system 8 also includes a tag battery recharge unit 16 .
- Tag 10 contains a rechargeable battery that when placed in proximity of battery recharge unit 16 , recharges the battery to allow tag 10 to operate for a given period of time such as, for example, for several months.
- tag 10 advantageously contains a magnetic element that can operate in different modes.
- the first mode is an EAS mode that allows tag 10 to be detected by the electronic detection units of the EAS system and also broadcasting an EAS alarm message to an RFID reader.
- the second mode is an energy harvesting mode that allows the battery of tag 10 to be recharged when brought in proximity to battery recharge unit 16 .
- the third mode is an RFID mode where the tagged item RFID element can be read or written to, by using an RFID reader
- FIG. 2 is a block diagram of an exemplary security tag 10 and the electrical components contained therein.
- tag 10 includes a magnetic element 18 which can perform an EAS function, an energy harvesting function using a common core element, and an RFID function. This arrangement is described in greater detail below.
- Magnetic element 18 is not limited to a particular arrangement and can, for example, have a ferrite or laminated magnetic material core around which is a single winding. Magnetic element 18 operates in two different modes, each corresponding to a different frequency. One frequency corresponds to the EAS function, represented by EAS detection module 20 , and the other frequency corresponds to the energy harvesting feature, represented by the energy harvesting module 22 .
- tags 10 also include an alarm circuit 24 that include a processor and audible alarm transducer such that when tag 10 is interrogated by an EAS detection unit 14 , the tag 10 emits an audible, visual or tactile alert.
- tag 10 includes an RFID element 26 , which provides a signal to an RFID reader informing the RFID reader of the occurrence of an alarm event generated by tag 10 .
- RFID element 26 can also inform the RFID reader of the tag's battery charge status in order to determine if and when tag 10 needs recharging.
- FIG. 3 is a perspective view of an exemplary security tag 10 utilizing the present invention.
- Tag 10 includes an attachment mechanism 28 and a plurality of openings 30 .
- Attachment mechanism 28 can be in the form of a clamp having a pin, which allows tag 10 to be attached to an object, such as a garment. The pin is inserted through the object and is locked to the body 31 of the tag.
- POS point of service
- tag 10 is removed from the object to which it is attached and/or is deactivated. Should an object be taken beyond the POS without its tag 10 being deactivated or removed, an alarm will sound via an internal speaker mounted just below the openings 30 in tag 10 . The alarm will be activated and the sound will permeate through openings 30 in tag 10 .
- FIG. 4 is a schematic drawing of one exemplary embodiment of the present invention.
- the schematic of FIG. 4 depicts the various electrical components within tag 10 that allow tag 10 to be interrogated in an EAS system environment as well as allowing a rechargeable battery within tag 10 to be recharged when brought in proximity to battery recharge unit 16 .
- Tag 10 has a magnetic element acting as a low frequency antenna, which includes a single winding over a magnetic core material.
- the winding and magnetic core are represented by inductor 32 and resistor 34 .
- Voltage V 1 appears across the magnetic core winding.
- the signal received by the antenna drives two circuits, an EAS circuit and an energy harvesting circuit. Each circuit resonates at a particular frequency.
- the EAS circuit may resonate at a first frequency (F 1 ) of 58 kHz and the energy harvesting circuit may resonate at a second frequency (F 2 ) of 125 kHz.
- F 1 first frequency
- F 2 second frequency
- a switch 36 connects the core output voltage V 1 to either capacitor 38 or capacitor 40 .
- switch 36 In the normally closed position, switch 36 connects pins 1 and 2 so that the EAS series circuit is closed, including inductor 32 , resistor 34 and capacitor 38 .
- This magnetic field can induce a voltage V 1 having a particular frequency depending upon the magnetic field, i.e., a magnetic field produced by an EAS system or a battery recharging station.
- the contacts 1 and 2 of switch 36 are shorted together by default, enabling the EAS circuit and placing tag 10 in an EAS mode.
- tag 10 can generate a response or an alarm signal when it passes through an EAS interrogation zone.
- voltage V 1 is generated and applied to a frequency detection circuit 44 .
- Frequency detection circuit 44 determines the frequency associated with the voltage V 1 signal and may use bandpass filters and comparators, for example. If frequency detection circuit 44 determines that the frequency corresponds to the EAS mode, i.e., frequency F 1 , frequency detection circuit 44 can produce an EAS alarm enable signal 46 .
- tag 10 when tag 10 is brought to a location near pedestals 14 of an EAS system, the magnetic element of tag 10 generates a voltage at a frequency which frequency detection circuit 44 recognizes as a frequency related to an EAS interrogation signal (F 1 ). This frequency corresponds to the resonating frequency of the EAS circuit.
- F 1 EAS interrogation signal
- the contacts 1 and 2 of switch 36 remain shorted together, and when voltage V 1 reaches a predetermined level, frequency detection circuit 44 produces an EAS alarm enable signal 46 .
- Certain security tags 10 commonly known as “alarming” tags, include a processor and audible alarm transducer within the actual tag device.
- security tag 10 “knows” when it has been interrogated by an EAS portal and emits an audible alert when triggered.
- EAS alarm enable signal 46 triggers an EAS alarm circuit 48 , which is connected to an alarm device 50 , such as a piezoelectric speaker.
- Alarm circuit 48 produces an EAS alarm activation signal 49 , which drives alarm device 50 to emit an alarm signal.
- alarm device 50 need not be audible, but can be a visual alarm device, such as a strobe light, or any other type of alarm capable of alerting a third party that an EAS alarm event has occurred.
- voltage Vb is provided to alarm circuit 48 to drive alarm device 50 .
- Tag 10 includes a rechargeable battery 52 having a voltage Vb, which when brought into proximity to battery recharge unit 16 , can be recharged in order to allow tag 10 to be reused.
- Vb voltage
- frequency detection circuit 44 detects a frequency F 2 and sends a switch enable signal 53 to switch 36 .
- switch 36 disconnects contacts 1 and 2 and connects contacts 1 and 3 , thus connecting the magnetic core to capacitor 40 and energy harvesting circuit 42 .
- one embodiment of the present invention provides two circuits, an EAS circuit resonating at one frequency and battery recharging circuit 42 resonating at a second frequency, both provided within one EAS tag 10 .
- EAS alarm enable signal 46 is transmitted to one of the I/O ports of an RFID element 54 , within EAS tag 10 .
- RFID element 54 can be either a battery assisted or active chip or device.
- RFID element 54 can transmit a wireless signal or message to an RFID reader 55 .
- the signal from RFID element 54 to RFID reader 55 informs RFID reader 55 that an EAS alarming condition has occurred in tag 10 .
- the signal can include tag identification information about tag 10 , thus informing RFID reader 55 not only that an EAS alarm event has occurred but also to which tag 10 the alarm event relates. This is especially useful for store management so they instantly know what items are setting off the EAS system.
- RFID element 54 also receives a signal indicating the charge status of battery 52 . Based on this signal, RFID element 54 transmits a low battery signal to RFID reader 55 when a voltage of rechargeable battery 52 voltage falls below a predetermined threshold. At the POS, when the tag 10 is removed from its item, an RFID reader 55 can detect the battery charge status from RFID element 54 and transmit an alert that a particular tag needs to be recharged. When a tag 10 having a low battery charge is placed in proximity of battery recharge unit 16 ( FIG. 1 ), RFID element 54 can continue to report on the status of the battery charge for its tag by utilizing the ID code of the tag 10 .
- FIG. 5 depicts an alternate exemplary embodiment of the invention.
- a dual winding is used over a single magnetic core.
- a first EAS winding 56 is represented in FIG. 5 by inductor 58 and resistor 60 .
- the first EAS winding 56 is placed in an electrically parallel relationship with capacitor 62 , thereby being tuned to an associated frequency F 1 .
- Voltage V 1 appears across the magnetic core when placed in a magnetic field having a frequency F 1 .
- an EAS signal enable circuit 64 creates an enable signal 66 that triggers an alarm circuit 68 driving an alarm device 70 , such as a piezoelectric speaker, a strobe light or the like.
- enable signal 66 may also be applied to RFID chip 72 through one of the I/O ports allowing an EAS alarm signal to be sent to a remote RFID reader 86 .
- a second winding 74 is represented by inductor 76 and resistor 78 , in series with capacitor 80 and is tuned to frequency F 2 .
- energy harvesting circuit 82 provides a battery recharge signal 83 at voltage Vb to battery 84 , recharging battery 84 .
- This embodiment is similar to the earlier-described embodiment except that it uses an additional winding layer and does not use a switch or a frequency detection circuit.
- the present invention advantageously provides a security tag 10 that uses a single magnetic core to provide an EAS detection signal, an EAS internal alarm signal that can also be sent wirelessly using the RFID element to a RFID reader, and an energy harvesting signal for charging an internal rechargeable battery.
- a battery assisted or active RFID element may be used in security tag 10 to create an EAS alarm mode signal and to monitor the battery charge state.
- a single printed circuit board may be used in tag 10 to support all of the components that are used for EAS and RFID functions.
- the present invention can be realized in hardware, software, or a combination of hardware and software. Any kind of computing system, e.g., digital signal processor, gate array, microcontroller, etc., or other apparatus adapted for carrying out the methods described herein, is suited to perform the functions described herein.
- Any kind of computing system e.g., digital signal processor, gate array, microcontroller, etc., or other apparatus adapted for carrying out the methods described herein, is suited to perform the functions described herein.
- Software in the present context means any expression, in any language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following a) conversion to another language, code or notation; b) reproduction in a different material form.
Abstract
Description
Claims (20)
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/852,918 US8648721B2 (en) | 2010-08-09 | 2010-08-09 | Security tag with integrated EAS and energy harvesting magnetic element |
AU2011289902A AU2011289902B2 (en) | 2010-08-09 | 2011-08-08 | Security tag with integrated EAS and energy harvesting magnetic element |
CA2807925A CA2807925C (en) | 2010-08-09 | 2011-08-08 | Security tag with integrated eas and energy harvesting magnetic element |
EP11758579.4A EP2603906B1 (en) | 2010-08-09 | 2011-08-08 | Security tag with integrated eas and energy harvesting magnetic element |
ES11758579.4T ES2535094T3 (en) | 2010-08-09 | 2011-08-08 | Safety label with integrated EAS and magnetic energy recovery element |
CN201180046686.2A CN103124989B (en) | 2010-08-09 | 2011-08-08 | There is the safety label of integrated eas and energy harvesting magnetic element |
KR1020137006046A KR101819092B1 (en) | 2010-08-09 | 2011-08-08 | Security tag with integrated eas and energy harvesting magnetic element |
PCT/US2011/001397 WO2012021161A1 (en) | 2010-08-09 | 2011-08-08 | Security tag with integrated eas and energy harvesting magnetic element |
HK13109183.3A HK1181910A1 (en) | 2010-08-09 | 2013-08-06 | Security tag with integrated eas and energy harvesting magnetic element eas |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/852,918 US8648721B2 (en) | 2010-08-09 | 2010-08-09 | Security tag with integrated EAS and energy harvesting magnetic element |
Publications (2)
Publication Number | Publication Date |
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US20120032803A1 US20120032803A1 (en) | 2012-02-09 |
US8648721B2 true US8648721B2 (en) | 2014-02-11 |
Family
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US12/852,918 Active 2032-12-12 US8648721B2 (en) | 2010-08-09 | 2010-08-09 | Security tag with integrated EAS and energy harvesting magnetic element |
Country Status (9)
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US (1) | US8648721B2 (en) |
EP (1) | EP2603906B1 (en) |
KR (1) | KR101819092B1 (en) |
CN (1) | CN103124989B (en) |
AU (1) | AU2011289902B2 (en) |
CA (1) | CA2807925C (en) |
ES (1) | ES2535094T3 (en) |
HK (1) | HK1181910A1 (en) |
WO (1) | WO2012021161A1 (en) |
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KR101531396B1 (en) * | 2014-12-31 | 2015-07-06 | 성균관대학교산학협력단 | A cognitive radio device for energy harvesting and a method for controlling thereof |
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US9894471B1 (en) | 2015-07-25 | 2018-02-13 | Gary M. Zalewski | Wireless coded communication (WCC) devices with power harvesting power sources for processing biometric identified functions |
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US10417889B2 (en) * | 2015-08-12 | 2019-09-17 | Sensormatic Electronics, LLC | Hard tag locking clamp with energy harvesting element |
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US10997838B2 (en) | 2018-03-16 | 2021-05-04 | Sensormatic Electronics, LLC | Systems and methods for deactivation of acousto-magnetic electronic article surveillance markers |
US10949723B2 (en) * | 2018-04-30 | 2021-03-16 | Sensormatic Electronics, LLC | Systems and methods for providing a tag with a miniature zero power motion detector and energy harvester |
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Also Published As
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KR101819092B1 (en) | 2018-01-16 |
EP2603906A1 (en) | 2013-06-19 |
AU2011289902B2 (en) | 2015-11-12 |
CN103124989B (en) | 2015-07-29 |
HK1181910A1 (en) | 2013-11-15 |
CA2807925A1 (en) | 2012-02-16 |
KR20130137150A (en) | 2013-12-16 |
ES2535094T3 (en) | 2015-05-05 |
CA2807925C (en) | 2021-10-26 |
AU2011289902A1 (en) | 2013-02-28 |
US20120032803A1 (en) | 2012-02-09 |
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CN103124989A (en) | 2013-05-29 |
EP2603906B1 (en) | 2015-02-25 |
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